| | December 31, | | ||||
| | 2017 | | 2016 | | ||
| | (in thousands) | | ||||
Less than one year | | $ | 858,207 | | | 843,880 | |
Between one and five years | | | 3,070,676 | | | 3,483,532 | |
More than five years | | | 3,491,748 | | | 4,011,338 | |
| | $ | 7,420,631 | | | 8,338,750 | |